#include <stdio.h>
#include <stdlib.h>

int main (int argc, char **argv) {
  int a, b, c, d, e, f, x;

  if (argc < 3) {
    printf ("USAGE: %s <a> <b>\n", argv[0]);
    exit (0);
  }

  a = atoi (argv[1]);
  b = atoi (argv[2]);
  printf ("You entered (%i, %i) for (a, b).\n", a, b);

  if (a == 0) goto ZERO;
  if (b == 0) goto ZERO;
  if (a == 1) goto AONE;
  if (b == 1) goto BONE;
  if (b > 1) goto BPOS;

  c = 0;

 BNEG:
  d = a;
  if (d > 0) goto DPOS;

 DNEG:
  c = c + 1;
  d = d + 1;
  if (d == 0) goto DEND;
  goto DNEG;

 DPOS:
  c = c - 1;
  d = d - 1;
  if (d > 0) goto DPOS;

 DEND:
  b = b + 1;
  if (b == 0) goto BEND;
  goto BNEG;

 BEND:
  x = c;
  goto END;

 BPOS:
  e = a;

 BPOSLOOP:
  f = a;
  if (f > 0) goto FPOS;

 FNEG:
  e = e - 1;
  f = f + 1;
  if (f == 0) goto FEND;
  goto FNEG;

 FPOS:
  e = e + 1;
  f = f - 1;
  if (f > 0) goto FPOS;

 FEND:
  b = b - 1;
  if (b > 1) goto BPOSLOOP;

  x = e;
  goto END;

 AONE:
  x = b;
  goto END;

 BONE:
  x = a;
  goto END;

 ZERO:
  x = 0;

 END:
  printf ("x = a * b\n");
  printf ("x = %i\n", x);
  return 1;
}